How do you set up and run Selenium tests in headless browsers like Chrome or Firefox?

To set up and run Selenium tests in headless browsers like Chrome or Firefox, you need to configure the WebDriver with headless mode enabled. For Chrome, use options.add_argument("--headless"), and for Firefox, use options.headless = True. This allows running tests without opening a visible browser window, improving execution speed. Headless testing is ideal for CI/CD pipelines and automated environments. In Selenium software testing, headless mode helps in running UI tests efficiently without manual intervention. Ensure the WebDriver is updated, and all required dependencies are installed for seamless execution. This method significantly enhances test performance and resource utilization.